Browse Prior Art Database

Original Publication Date: 1994-Apr-30
Included in the Prior Art Database: 2004-Apr-07

Publishing Venue

Xerox Disclosure Journal


The present disclosure is directed to a scanner for reducing image blur due to motion when reading image data. More particularly, the disclosure is directed to an asynchronous scanner that utilizes a stroboscopic light source having a varying or constant strobing frequency and a varying or constant number of strobe cycles in a single strobing operation. In conventional scanners, a document is illuminated by a light source in a continuous manner while a CCD array is passed along the document to receive image data from each scanline. In other words, the document remains illuminated while the CCD array moves from one scanline to another scanline. Such a process can cause image blur due to motion, caused by a residual charge on the CCD array from a scanline before the CCD array reads the desired scanline. This charge is usually formed by light received when the CCD array in between scanlines. To ensure a sharp image, the residual charge should either be prevented or removed before reading the desired scanline.